Is It Wrong to Put Tracking Devices on Teens’ Phones?

Our Bull family member, Emily, needs some advice. Her 15-year-old daughter came home wasted after a party, and now, Emily's husband has put a tracking device on her daughter's phone to know where she is at all times. Emily thinks this is an invasion of her daughter's privacy. She's worried about her daughter finding out about the tracking device.

Thankfully, I didn't have this issue with my older sons. But if I did, I would have no problem putting tracking devices on their phones. They'd have violated my trust by getting wasted at a party. I pay their cellphone bill, so until they get a job and pay their own bills, I have every right as their parent to track their every move!

Do you think it's wrong that Emily's husband put a tracking device on their daughter's phone?